Cod liver oil is a rich source of _____A. IodineB. Vitamin AC. Vitamin BD. Vitamin C

The correct answer is C. Vitamin D.
Cod liver oil is a nutritional supplement that is particularly known for being a rich source of several important nutrients, most notably vitamin D, as well as vitamin A and omega-3 fatty acids. However, it is particularly renowned for its high content of vitamin D.
Explanation of the options:
1. Iodine (A): While iodine is an essential mineral found in certain foods like seafood and iodized salt, cod liver oil is not a particularly rich source of iodine. Its primary nutrients are vitamins A and D.
2. Vitamin A (B): Cod liver oil is indeed a good source of vitamin A, which is essential for maintaining healthy vision, skin, and the immune system. However, the most prominent nutrient it is known for is vitamin D, which is why it is commonly recommended for supporting bone health.
3. Vitamin D (C): This is the correct answer. Cod liver oil is particularly rich in vitamin D, which is important for the absorption of calcium and phosphorus, helping to maintain healthy bones and teeth. It also supports immune function and mood regulation.
4. Vitamin C (D): Cod liver oil does not contain significant amounts of vitamin C. Vitamin C is typically found in fruits and vegetables like citrus fruits, strawberries, and peppers, but it is not abundant in cod liver oil.
Therefore, the correct answer is C. Vitamin D, as cod liver oil is a particularly rich source of this vitamin.